Henderson is an elevated coralline limestone ( "makatea") island which rises as an isolated conical mound from a depth of about 3.5 km, and is presumably a reef-capped volcano.    From Wordnik.com.  [Henderson Island, United Kingdom] Reference

Henderson Island is currently one of the most few relatively undisturbed makatea (raised limestone) islands in the world.    From Wordnik.com.  [Tuamotu tropical moist forests] Reference

In the makatea zones, however, most species are indigenous, and have been preserved because of the rough, almost inaccessible terrain.    From Wordnik.com.  [Cook Islands tropical moist forests] Reference

Vegetation in the volcanic inner hills of the makatea islands has been almost completely introduced, with the area mostly given over to cultivation.    From Wordnik.com.  [Cook Islands tropical moist forests] Reference

The makatea islands have similar flora to Rarotonga, with differences related to their structurally variability (volcanic vs. makatea (limestone) substrates).    From Wordnik.com.  [Cook Islands tropical moist forests] Reference